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Ordinal notation — In mathematical logic and set theory, an ordinal notation is a finite sequence of symbols from a finite alphabet which names an ordinal number according to some scheme which gives meaning to the language. There are many such schemes of ordinal… … Wikipedia
Small Veblen ordinal — In mathematics, the small Veblen ordinal is a certain large countable ordinal, named after Oswald Veblen. It is occasionally called the Ackermann ordinal, though the Ackermann ordinal described by harvtxt|Ackermann|1951 is somewhat smaller than… … Wikipedia
Ackermann ordinal — In mathematics, the Ackermann ordinal is a certain large countable ordinal, named after Wilhelm Ackermann. The term Ackermann ordinal is also occasionally used for the small Veblen ordinal, a somewhat larger ordinal. Unfortunately there is no… … Wikipedia
Wilhelm Ackermann (Mathematiker) — Wilhelm Ackermann Wilhelm Friedrich Ackermann (* 29. März 1896 in Schönebecke (Herscheid); † 24. Dezember 1962 in Lüdenscheid) war ein deutscher Mathematiker. Inhaltsverzeichnis … Deutsch Wikipedia

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